On taking over charge, 'Amr b Al 'Aas reviewed the situation, and decided that instead of attacking Alexandria forthwith, the Byzantines should be drawn inside the country, and then given a battle.
The Byzantine force advanced from Alexandria, and marched to Fustat with a view to capturing it. The Muslim force under 'Amr b Al 'Aas marched from Fustat to meet the Byzantines half way. The two forces met at Naqyus.
The battle began with a duel between the Byzantine General, and a Muslim warrior Haumal bin Abu Madhhij. As a result of the duel both the contestants died. Thereafter the two forces clashed. In spite of their superiority in strength, the Byzantines were defeated and they retreated to Alexandria.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari